{"title":"Back Up Rings","description":null,"products":[{"product_id":"back-up-ring-20018744a-20007831a-bh2507308a","title":"20018744B - Back-Up Ring - Polyamide 6.6, 18.5 x 21.6 mm","description":"\u003cp\u003e\u003c!-- x-tinymce\/html --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNavien 20018744B - Back-Up Ring - Polyamide 6.6, 18.5 x 21.6 mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Navien 20018744B Back-Up Ring is a genuine OEM part designed to provide structural support for seals and O-rings in high-pressure areas of Navien water heaters and boilers. Made of durable Polyamide 6.6, it prevents deformation and leakage by reinforcing joint stability. This part is commonly used in systems requiring robust seal retention, especially where thermal expansion and mechanical stress are present.\u003c\/p\u003e\n\u003cp\u003eCompatible with a wide range of Navien units, including:\u003c\/p\u003e\n\u003cul data-start=\"638\" data-end=\"840\"\u003e\n\u003cli data-start=\"638\" data-end=\"679\"\u003eNPE Series tankless water heaters\u003c\/li\u003e\n\u003cli data-start=\"680\" data-end=\"725\"\u003eCR\/CC Series condensing water heaters\u003c\/li\u003e\n\u003cli data-start=\"726\" data-end=\"785\"\u003eNCB, NCB-ASME, CH, and CH-ASME Series combi-boilers\u003c\/li\u003e\n\u003cli data-start=\"786\" data-end=\"840\"\u003eNR\/NP Series condensing tankless water heaters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003cp style=\"text-align: right;\"\u003e\u003csup\u003e\u003cspan style=\"color: #999999;\"\u003ePNAV000095\u003c\/span\u003e\u003c\/sup\u003e\u003c\/p\u003e","brand":"Navien","offers":[{"title":"Default Title","offer_id":38067027837125,"sku":"20018744B","price":0.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/6150\/2518\/files\/91104611-8bfd-4237-894b-0dc77894b025.png?v=1753475026"}],"url":"https:\/\/www.supplystop.com\/collections\/back-up-rings\/series-nr-np.oembed","provider":"SupplyStop.com","version":"1.0","type":"link"}